This is relatively straightforward to sort out within Bryce, at least in an informal, 'by eye' sense. In the example here I set the FOV to 85 as per catlin_mc's question. Duplicated cubes with 'Office Building' material sit in the default scene and serve as 'architecture'. The point of view is looking up from a low position to accentuate the issue of converging verticals. To achieve the 'architectural drawing' type perspective in the lower picture, press the space bar and drag the work-window view down a bit (in this case I dragged until the bottom of the view port was about one quarter of the way up the length of the foreground cube). Then use the camera trackball to reposition the horizon at the same height as before and adjust the view of the buildings using the camera xy and zoom controls. It's a bit of a fiddle at first, but you'll soon get the feel of how much to space-bar-drag, and compensate afterwards, to get parallel verticals for a similar horizon height. While fiddling, you will almost certainly notice that you can distort the image so much that the verticals actually *diverge* when looking up from a low angle! In a recent-ish thread here, I mentioned that with all the camera and view controls it is possible to achieve some very weird perspective effects. I also mentioned that the view memory dots are your friends when exploring these strange angles...